Since I was quite apalled by the AN staff to enforce profanity on groups and such, I would just like to arise the question why swearing is bad at all, and why particularly children must be protected.
Is it because they can hear "nasty" words connected to the human organs? I tell you, by the time a child is 13 they know most common swearing words. They didn't get it from TV or internet. They got it from their parents and friends. And what is the bad thing knowing the offensive version of male genitalia?
In themselves, swearing words are harmless. Swearing words are in fact, good words as such when we want to show that we are angry or put extra weight and importance to what we say. Sure, some of them are offensive, but that is only because we make them so. Eupheisms are made all the time. Look at the word toilet for example. At first it was water closet, then lavatory, now it's toilet.
Personally, language is language. You can do as much harm using no swearing words than if you do (sarcasm anyone?). I remember that when I was 4 or 5, I already knew words such as dick and cock. I also knew the meaning of it, in the harmless ways children know things at such ages. Instead of personally trying to hide such words for your children, you should probably discuss them as soon you find out they know them. As I said, words themselves are completely harmless. They are just abstract things in our heads. The more we try to hide and avoid certain words, the worse connotations they will get.